Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 651-661 |
| Number of pages | 11 |
| Journal | Radiochimica Acta |
| Volume | 92 |
| Issue number | 9-11 |
| DOIs | |
| Publication status | Published - 2004 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- modelling
- radionuclide transport
- sorption
- surface complexation
- uranium
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Uranium adsorption on weathered schist : Intercomparison of modelling approaches. / Payne, T.E.; Davis, J.A.; Ochs, M.; Olin, Markus; Tweed, C.J.
In: Radiochimica Acta, Vol. 92, No. 9-11, 2004, p. 651-661.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Uranium adsorption on weathered schist
T2 - Intercomparison of modelling approaches
AU - Payne, T.E.
AU - Davis, J.A.
AU - Ochs, M.
AU - Olin, Markus
AU - Tweed, C.J.
PY - 2004
Y1 - 2004
N2 - Experimental data for uranium adsorption on a complex weathered rock were simulated by twelve modelling teams from eight countries using surface complexation (SC) models. This intercomparison was part of an international project to evaluate the present capabilities and limitations of SC models in representing sorption by geologic materials. The models were assessed in terms of their predictive ability, data requirements, number of optimised parameters, ability to simulate diverse chemical conditions and transferability to other substrates. A particular aim was to compare the generalised composite (GC) and component additivity (CA) approaches for modelling sorption by complex substrates. Both types of SC models showed a promising capability to simulate sorption data obtained across a range of chemical conditions. However, the models incorporated a wide variety of assumptions, particularly in terms of input parameters such as site densities and surface site types. Furthermore, the methods used to extrapolate the model simulations to different weathered rock samples collected at the same field site tended to be unsatisfactory. The outcome of this modelling exercise provides an overview of the present status of adsorption modelling in the context of radionuclide migration as practised in a number of countries worldwide.
AB - Experimental data for uranium adsorption on a complex weathered rock were simulated by twelve modelling teams from eight countries using surface complexation (SC) models. This intercomparison was part of an international project to evaluate the present capabilities and limitations of SC models in representing sorption by geologic materials. The models were assessed in terms of their predictive ability, data requirements, number of optimised parameters, ability to simulate diverse chemical conditions and transferability to other substrates. A particular aim was to compare the generalised composite (GC) and component additivity (CA) approaches for modelling sorption by complex substrates. Both types of SC models showed a promising capability to simulate sorption data obtained across a range of chemical conditions. However, the models incorporated a wide variety of assumptions, particularly in terms of input parameters such as site densities and surface site types. Furthermore, the methods used to extrapolate the model simulations to different weathered rock samples collected at the same field site tended to be unsatisfactory. The outcome of this modelling exercise provides an overview of the present status of adsorption modelling in the context of radionuclide migration as practised in a number of countries worldwide.
KW - modelling
KW - radionuclide transport
KW - sorption
KW - surface complexation
KW - uranium
U2 - 10.1524/ract.92.9.651.54992
DO - 10.1524/ract.92.9.651.54992
M3 - Article
VL - 92
SP - 651
EP - 661
JO - Radiochimica Acta
JF - Radiochimica Acta
SN - 0033-8230
IS - 9-11
ER -